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Old 02-04-2011, 04:58 AM   #1
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4.56 front, 4.65 rear?

Will they work under the same Jeep?

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Old 02-04-2011, 05:13 AM   #2
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Will they work under the same Jeep?
Noo you will do damage to ur jeep. You have to have same ratios in front and rear.

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Old 02-04-2011, 05:20 AM   #3
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Old 02-04-2011, 05:26 AM   #4
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I've heard that 1% is Ok but 4.65-4.56=0.9 is more than that...
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Old 02-04-2011, 06:14 AM   #5
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Old 02-04-2011, 06:26 AM   #6
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Old 02-04-2011, 10:13 AM   #7
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Exact ratios ae not needed. I ran 5.86 rear and 5.89 front for a long time with no issues.

I would be leary about the differences you are talking about though.
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Old 02-04-2011, 10:17 AM   #8
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they are never exactly the same....for if they were you would never be able to get it in and out of 4x4. 98 percent of them are .01 off
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Old 02-04-2011, 10:23 AM   #9
Knows a couple things...

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Originally Posted by exm38a1er View Post
Will they work under the same Jeep?
I think you meant to say 4.56 and 4.55 which is a common front and rear axle mix of ratios. With the exception of the Rubicon because it has matching Dana 44 axles front and rear, all of our Jeeps have a .01 difference in ratio between the front and rear axle... 3.55/3.54, 3.07/3.08, 3.73/3.74, 4.10/4.11, etc.. The reason for that is the front and rear axles have different diameter ring gears which makes it cost prohibitive for the R&P manufacturers to make them exactly the same.

And on the highway it doesn't matter since you're in 2wd. Offroad, it doesn't matter either since the loose offroad traction has the wheels slipping against each other anyway.

And if you were in 4x4 on the highway on a dry paved road, the 4x4 system would still bind up even if the front and rear axle ratios matched perfectly anyway. That is because in turns and even minor curves in the road, the front tires rotate faster than the rear even more dramatically than that .01 ratio difference makes.
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Old 02-04-2011, 10:31 AM   #10
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The drive ratio is determined by how many times the ring gear turns in relationship to the pinion. That transfers to how many times the tire turns under power from the drive shaft. Since you have one transfer case turning two drive shafts at the same rate, both axles need to be turning together. If the ratios are different the wheels can not spin at the same speed so huge pressures repot on the axles and the Tcase...something will give and go crunch. There is a very small amount of forgiveness in the drive train allowing for a slight difference but the numbers you gave are beyond safe. I'm not familiar with 4.65 gears. Where are they from?
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Old 02-04-2011, 10:32 AM   #11
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I guess I was typing when Jerry posted...
Yes....like that.
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Old 02-04-2011, 11:00 AM   #12
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No Jerry i meant 4.65.
I've read Texas T in one of Moses Ludel's books that 1% deference is accepted.I've posted before i make the maths
The reasom i'm asking is because i want to replace my rear 35 with one from Nissan Patrol which i can get for free.
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Old 02-04-2011, 11:09 AM   #13
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Not to hijack the thread witch I am doing (sorry) but I've never heard of a Nissan Patrol before until just now.. So for those who have no clue what one is this is the 2011 Nissan Patrol SUV Officially Revealed, More Upscale and with New 400HP V8 - Carscoop ... link has a nice little write up on it and plenty of pics
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Old 02-04-2011, 11:23 AM   #14
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Quote:
Originally Posted by exm38a1er View Post
No Jerry i meant 4.65.
I've read Texas T in one of Moses Ludel's books that 1% deference is accepted.I've posted before i make the maths
The reasom i'm asking is because i want to replace my rear 35 with one from Nissan Patrol which i can get for free.
I think the ratio is still to far apart. Also is the wheel bolt pattern the same?
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Old 02-04-2011, 11:26 AM   #15
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Ok...after reading about the Nissan, I think getting the axle free should be exchanged for getting the engine free. 400hp!!???
BTW. I still would not run that different of axle ratios.
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Old 02-04-2011, 11:28 AM   #16
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I think the ratio is still to far apart. Also is the wheel bolt pattern the same?
No,it's 6 lug ,but is 58" WMS to WMS and maybe a spacer/adapter could fix that.
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Old 02-04-2011, 11:30 AM   #17
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Ok...after reading about the Nissan, I think getting the axle free should be exchanged for getting the engine free. 400hp!!???
BTW. I still would not run that different of axle ratios.
I'm located in EU and the Nissan Patrol i'm talking about is 12 yrs old(and def no 400HPs
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Old 02-04-2011, 11:41 AM   #18
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No,it's 6 lug ,but is 58" WMS to WMS and maybe a spacer/adapter could fix that.
Yes a lug adapter would be a way to fix it. I would also guess you will need an adaptor to the yoke for the driveshaft.
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Old 02-04-2011, 12:28 PM   #19
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Yes and the bracketry but since there is no way to much them...
Maybe i can get a Toyota with a factory 4.56 and E-locker.4cyl are even 5 lugs no
e-locker and 2wd are with the e-locker but 6 lugs...
You can't always get what you want...(Rolling Stones...)
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Old 02-04-2011, 04:52 PM   #20
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Just a question from an observer, if you already have 4:56 gears in the front the rear must be the same, so just wondering what you can gain with all the work and expense to install the 4:65 from a different vehicle under the rear? Is the rear gearing shot or is the Nissan rear end a heavier duty one?
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Old 02-04-2011, 05:27 PM   #21
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The gear ratio is the number of teeth in the Bevel Ring Gear divided by the number of teeth in the Bevel Pinion.

Example:
44 tooth gear
10 tooth pinion
=4.4 ratio

We make bevel gear sets where I work....along with lots of other gears.

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